PI WSDL URL not accessibile

Hi All,

I have a generated a webservice from PI....The problem now is that it could not be called outside our company domain. How can a legacy system which is outside our domain should call the PI webservice ? Is jus giving WSDL file sufficient ? if this is the case How can a legacy system could push the data to WSDL when it could even access the PI WSDL URL ?

Can you all let me know how to handle these kind of issue ?

Thanks in Advance.